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From: brian@sdcc3.UUCP (Brian Kantor)
Newsgroups: net.mail
Subject: Re: Sendmail problems - HELP!
Message-ID: <2773@sdcc3.UUCP>
Date: Wed, 3-Apr-85 13:14:01 EST
Article-I.D.: sdcc3.2773
Posted: Wed Apr  3 13:14:01 1985
Date-Received: Fri, 5-Apr-85 05:27:10 EST
References: <325@mnetor.UUCP> <655@plus5.UUCP> <403@utai.UUCP>
Organization: UCSD wombat breeding society
Lines: 55

>     I wouldn't mind hearing about better algorithms.  We had a problem with
> conflicts between CSNET names & local network nicnames, that caused some mail
> to be sent to Amsterdam for a couple of days.  I came up with a shell script
> that munges the CSNET name file until it doesn't conflict.

What I finally wound up doing for UCSD was modifying a copy of the
Berkeley sendmail.cf files.  How it works is:

	First, any address of the form  a!b  is transformed into
	b@a.uucp.  This applies to an address having more than one bang
	in it, so that a!b!c!d becomes b!c!d@a.uucp.

	a@b.bitnet  becomes  a%b.bitnet@wiscvm.arpa

	a@b.csnet   becomes  a%b.csnet@csnet-relay.arpa

	a@b.dec     becomes  a%b.dec@decwrl.arpa

	a@b  has the local domain tacked onto it (later removed) so that
	for a while, it becomes  a@b.local

	Any address of the form  a@b.domain  is unmodified.

	If the domain is arpa (as in a@b.arpa) or milnet (soon to be
	EDU, COM, GOV, and others), its sent to the tcp mailer for
	delivery over the internet.

	If the domain is uucp, its transformed from b@a.uucp back into a
	banged address a!b and given to uucp to deliver.

	Finally, the host part (b of a@b.local) is examined to see if the
	host is a local one on the ethernet.  If so, its sent by the
	ethernet mailer.  Otherwise, the default is to strip off the
	.local domain, and its given to the tcp mailer for internet
	delivery.

This doesn't solve all our problems.  But it works quite well for almost
all of our mail, and we're constantly improving it as we run into new
and more interesting addresses.

There's a bunch of other code in there to hide local non-registered
hosts from the internet, and to send mail to VMS systems using the
Wollongong TCP/IP server, and the like.

If you'd seriously like a copy (its BIG!!!) of the sendmail.cf file, I
can send it to you.  Or maybe I'll post it to here or net.sources if
enough people want it.  As I say, its got bugs in it, but it does run.

	Brian Kantor	UC San Diego

	decvax\ 	brian@ucsd.arpa
	akgua  >---  sdcsvax  --- brian
	ucbvax/		Kantor@Nosc 

``You unlock this door with the key of imagination...''